$ query “AS45903” --type=asn → 1 result(s)

AS45903 · CMCTELECOM-VN

CMC Telecom Infrastructure Company

AS45903 is run by CMC Telecom Infrastructure Company and is a major transit provider, registered in Vietnam. The system announces a respectable 85 504 IPv4 addresses, and supports IPv6. Its primary geographic footprint is in Vietnam. This AS has recently updated its prefix announcements.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #3 in Vietnam — Top 10 by reach within country

Basic Information

Country
🇻🇳 Vietnam
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
August 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
350 / 36
IPv6 Prefixes (raw / aggregated)
138 / 2
IPv4 Addresses
85 504
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/34
Geolocated Countries
🇻🇳 Vietnam (139 776 IPs)
Prefix Changed
August 06, 2026

Reputation

Reputation
Good — 15 flagged IPs out of 85 504 total (0.02%)
Open Proxies
3 known open proxies in this network

Connectivity Summary

Upstream Providers
13 upstreams providing transit
Peers
202 networks exchanging traffic without transit
Downstream Customers
103 downstreams buying transit
Unclassified
5 unclassified BGP neighbors
Degree
323 unique BGP neighbors
Reach
6 263 networks in customer cone

Upstream Providers (13)

Prefix Lists

IPv4 Prefixes (350 total)

  • 101.99.0.0/18 (16 384 addresses (/18 prefix))
  • 113.20.96.0/19 (8 192 addresses (/19 prefix))
  • 203.205.32.0/19 (8 192 addresses (/19 prefix))
  • 42.96.32.0/19 (8 192 addresses (/19 prefix))
  • 183.91.0.0/19 (8 192 addresses (/19 prefix))
  • 203.205.16.0/20 (4 096 addresses (/20 prefix))
  • 203.171.16.0/20 (4 096 addresses (/20 prefix))
  • 202.134.16.0/21 (2 048 addresses (/21 prefix))
  • 115.165.160.0/21 (2 048 addresses (/21 prefix))
  • 103.63.112.0/21 (2 048 addresses (/21 prefix))
  • 45.122.232.0/21 (2 048 addresses (/21 prefix))
  • 45.122.240.0/21 (2 048 addresses (/21 prefix))
  • 103.63.104.0/21 (2 048 addresses (/21 prefix))
  • 203.205.0.0/22 (1 024 addresses (/22 prefix))
  • 144.48.24.0/22 (1 024 addresses (/22 prefix))
  • 103.9.196.0/22 (1 024 addresses (/22 prefix))
  • 103.229.40.0/22 (1 024 addresses (/22 prefix))
  • 103.63.120.0/22 (1 024 addresses (/22 prefix))
  • 103.224.168.0/22 (1 024 addresses (/22 prefix))
  • 103.246.220.0/22 (1 024 addresses (/22 prefix))
  • 45.122.248.0/22 (1 024 addresses (/22 prefix))
  • 103.108.132.0/22 (1 024 addresses (/22 prefix))
  • 203.205.8.0/22 (1 024 addresses (/22 prefix))
  • 119.82.140.0/22 (1 024 addresses (/22 prefix))
  • 119.82.138.0/23 (512 addresses (/23 prefix))
  • 203.205.12.0/23 (512 addresses (/23 prefix))
  • 45.122.254.0/23 (512 addresses (/23 prefix))
  • 203.205.6.0/23 (512 addresses (/23 prefix))
  • 119.82.134.0/23 (512 addresses (/23 prefix))
  • 119.82.130.0/23 (512 addresses (/23 prefix))
  • 119.82.132.0/24 (256 addresses (/24 prefix))
  • 203.205.5.0/24 (256 addresses (/24 prefix))
  • 45.122.252.0/24 (256 addresses (/24 prefix))
  • 124.158.14.0/24 (256 addresses (/24 prefix))
  • 119.82.137.0/24 (256 addresses (/24 prefix))
  • 119.82.129.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (138 total)

  • 2402:5300::/34
  • 2402:5300:4000::/35